COMBINED LAMP AND FAN ASSEMBLY

Abstract: A combined lamp and fan assembly has a housing (1) with a central enclosure (24) within which a low-voltage lamp (40) is mounted. Air flow passages (32) extend along the housing (1) around the outside of the enclosure (24). The passages (32) are open at their lower end and communicate at their upper end with a low-voltage fan (60) that is removably secured to the upper end of the housing (1).

Description: COMBINED LAMP AND FAN ASSEMBLY Technical Field This invention relates to assemblies of the kind comprising an outer housing including a lamp unit. The invention is more particularly concerned with combined ventilation and lighting assemblies. Background Art In many applications, both ventilation and lighting are mounted in a ceiling panel, such as in bathrooms, showers, lavatories and kitchens. The need to cut two holes in the ceiling panel causes increased work, disruption and weakening of the ceiling. Disclosure of Invention It is an object of the present invention to provide a combined ventilation and lighting assembly that avoids the need to have separate ventilation and lighting sites. According to one aspect of the present invention there is provided an assembly of the above-specified kind, characterised in that there is at least one air flow passage extending along the housing and opening at one end at the lower end of the assembly, and that a fan unit is releasably retained with the housing at the other end of the air flow passage such that air can be drawn through the assembly. The lamp unit is preferably located substantially centrally cross the width of the housing with the or each air flow passage extending around the outside of the lamp unit. The lamp unit may be located within an enclosure, the enclosure being supported within the housing by means of a plurality of radial supports. The lamp unit is preferably supported within the enclosure on a flange extending transversely of the enclosure, the flange having a vent aperture therethrough. The fan unit and the housing may have engaging catches and notches by which the fan unit is retained on the upper end of the housing. The fan unit and lamp unit may be controlled separately. Preferably, the fan unit and lamp unit both operate at not more than 50 volts. The housing may have an externally-extending flange at its lower end arranged to engage the underside of a ceiling panel. The assembly may include a removable bezel arranged to be retained to the lower end of the housing, there being an air flow passage into the housing via the bezel. Brief Description of the Drawings A combined lamp and fan assembly in accordance with the present invention, will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective, exploded view of the assembly; Figure 2 is a sectional side elevation of the assembly; Figure 3 is a perspective, exploded view of a modified assembly; and Figure 4 is a sectional side elevation of the modified assembly of Figure 3. Best Modes of Carrying Out the Invention With reference to Figures 1 and 2, the assembly has an outer housing 1 of an insulative plastics material and of a generally cylindrical shape. At its lower end, the housing 1 has a radially-projecting flange 10 with two screw-fixing holes 11. Two channels 12 and 13 of circular section extend vertically, opening externally of the housing via respective narrow slots 14 and 15. Each channel 12 and 13 contains the head 16 of a retaining member 17 having a curved finger 18, which projects horizontally out of the channel. The head 16 has a screw- threaded bore 19 receiving a threaded bolt 20, the head 21 of which is located in a recess 22 at the lower end of the housing. Internally, the housing 1 has a central, axial enclosure 24 of cylindrical shape and circular section, with a diameter about half that of the housing 1 so that there is an annular region between the enclosure and the housing. The enclosure 24 extends along a major part of the length of the housing, terminating a short distance above the lower end of the housing 1. The enclosure supports several radial, outwardly-extending webs 31, which divide the annular region between the outside of the enclosure 24 and the inside of the housing 1 into several vertical air flow passages 32. The airflow passages 32 extend along the length of the housing and are of arc-shape, extending around the outside of the enclosure 24. A mounting flange 25 extends transversely across the enclosure 24 about midway along its length, dividing the enclosure into an upper and lower part. The flange 25 is a horizontal disc with a central aperture 26 and four retaining slots 27 equally spaced around the aperture. Two internally- threaded bosses 28 project vertically upwards from the flange 25 on opposite sides of the aperture 26. The flange 25 also has several vent holes 29 (only one of which is shown) located around the periphery. The flange 25 serves to support a 12 volt ac halogen lamp unit 40 centrally across the width of the assembly. The lamp unit 40 comprises a conventional combined bulb and dichroic reflector 41 and an insulating mount 42. The bulb 41 has two contact pins 43 projecting from its upper rear end, which are a push fit within electrical sockets in the mount 42. A twin core power supply wire 44 extends upwardly from the mount 42, through the central aperture 26 and through the side of the housing 1. The mount 42 has two apertures 45 through which two screws 46 are screwed into the bosses 28 on the flange 25. The lower end of the housing 1 supports a decorative bezel 50. The bezel 50 has a central aperture 51 aligned with the bulb 41 and slightly smaller in diameter, so as to prevent the bulb falling out of the assembly if it should become loosened from the mount 42. The bezel 50 has an upwardly-projecting retaining collar 52, around the aperture 51, which has external recesses 53 shaped to receive internal catches 30 on the housing 1. The bezel 50 has a convex domed shape, when viewed from below, with an outer ring 54 supported by radially-projecting arms 55, which divide the bezel into two vent openings 56 of substantially semi-circular arc shape. The assembly is completed by ventilation means in the form of an electric fan unit 60 secured to the upper end of the housing 1. The fan unit 60 has an outer housing 61 of cylindrical shape and is open at both ends. A 12 volt ac motor 62 is supported axially of the housing 61, to drive an axial fan 63. The lower end of the fan housing 61 sits within the upper end of the housing 1 and is releasably retained with it by engagement of spring catches 64 on the housing 1 with notches 65 on the outside of the fan housing. At its upper end, the fan housing 61 is joined to ducting 66. Alternative fans, such as a centrifugal fan, could be used. In some applications it is not necessary to connect the fan to ducting. Industrial Applicability The assembly is installed in a ceiling panel 70 by cutting a circular hole 71 with a diameter slightly larger than the external diameter of the housing 1. The upper, rear end of the assembly (either with or without the fan unit 60 in place) is then pushed into the hole 71 until the flange 10 contacts the ceiling panel 70. The assembly can be secured to the panel 70 in one of two ways. If the ceiling panel 70 were sufficiently thick and dense to retain a screw securely, the flange 10 could be secured to the panel 70 by screws 72 through the holes 11. Alternatively, or additionally, the retaining members 17 could be used. The head 21 of each bolt 20 is engaged by a screwdriver and rotated clockwise. Initially, this swings the fingers 18 outwardly in a clockwise sense (when viewed from below) to the limit of their rotation where they project at substantially right angles to the housing 1 beyond the edge of the hole 71, to overlap the panel 70. Further rotation of the bolts 20 causes the retaining members 17 to be pulled down along the channels 12 and 13 until they contact the upper surface of the panel 70. The bezel 50 is then held up to the assembly and pushed into position, thereby concealing the screws 72 and the bolts 20. The fan unit 60 and lamp unit 40 can be controlled together or independently as desired. When the fan is on, air is drawn in via the bezel 50, through the openings 56, along the passages 32 and out of the upper end of the housing 1. Air then passes through the fan housing 61 and into the ducting 66. Because the fan unit is removable from the lamp unit and both receive power independently of the other, it is possible to use the lamp without the fan or to use the fan without the lamp if desired. The housing 1 does not require any modification if it is to be used without the lamp unit 40 or without the fan unit 60. The lamp unit 40 can be attached to ducting without the fan unit so that heat generated by the lamp can flow away through the ducting. Installation of the assembly is relatively easy because of the need to form only one opening in the ceiling panel. Maintenance is also simplified. The bulb 41 can be replaced by simply pulling off the bezel 50, which gives access to the bulb. When the fan unit 60 needs to be removed for cleaning or maintenance, the housing 1 is released from the ceiling panel 70 and the entire assembly is dropped through the aperture 71. The fan unit can then be undipped from the housing 1. The assembly provides a very compact installation, this is especially useful where space is limited. Because the air flow passages extend around the outside of the enclosure 24, and hence around the lamp unit 40 within the enclosure, it helps to cool the housing 1 and reduces the risk of heat damage. The fan unit 60 and lamp unit 40 are controllable separately so that it is possible to have either the fan or the lamp on by itself, or both together. The low voltage of the fan and the lamp reduces the risk of electrocution where water is present, such as in bathrooms and showers. Higher voltages of up to about 50 volts could also be used safely in such applications. In dry environments, the fan and lamp could operate at mains voltage, such as at 240 volts ac. The assembly may have an alternative bezel 50', as shown in Figures 3 and 4, which conceals the air flow passages 32 by providing a lateral air intake. The bezel 50' has a retaining collar 52', which is about twice the length of the collar 52, so that the lower end of the bezel projects below and is spaced from the flange 10. The bezel 50' has a convex, domed annular plate 54' around the central aperture 51', without vent apertures. The edge of the plate 54' is spaced from the flange 10 by a gap forming an annular, lateral air intake 56', so that air can flow into the passages via the edge of the bezel. In order to give maximum light input, the bulb 41 is lowered by means of a spacer 70' fitted between the mount 42 and the flange 25. The spacer 70' is shaped like an inverted table with a horizontal platform 71' supporting four vertically-extending legs 72'. The legs 72' have catches 73' at their upper ends, which engage in the retaining slots 27 in the flange 25. Two internally-threaded sleeves 74' project from the upper surface of the platform 71'. The sleeves 74' are open at their lower end and have locating studs 75' projecting from their upper end aligned with and located in the bosses 28 in the flange 25. Two screws 46' secure the mount 42 to the sleeves 74' in the spacer 70'. In this way, the two assemblies with axial or side air intakes can be provided with many common components.

Claims: CLAIMS 1. An assembly comprising an outer housing including a lamp unit, characterised in that there is at least one air flow passage extending along the housing and opening at one end at the lower end of the assembly, and that a fan unit is releasably retained with the housing at the other end of the air flow passage such that air can be drawn through the assembly. 2. An assembly according to Claim 1, characterised in that the lamp unit is located substantially centrally cross the width of the housing. 3. An assembly according to Claim 2, characterised in that the or each air flow passage extends around the outside of the lamp unit. 4. An assembly according to Claim 2 or 3, characterised in that the lamp unit is located within an enclosure, and that the enclosure is supported within the housing by means of a plurality of radial supports. 5. An assembly according to Claim 4, characterised in that lamp unit is supported within the enclosure on a flange extending transversely of the enclosure, and that the flange has a vent aperture therethrough. 6. An assembly according to any one of the preceding claims, characterised in that the fan unit and the housing have engaging catches and notches by which the fan unit is retained on the upper end of the housing. 7. An assembly according to any one of the preceding claims, characterised in that the fan unit and the lamp unit are controllable separately. 8. An assembly according to any one of the preceding claims, characterised in that the fan unit and lamp unit both operate at not more than 50 volts. 9. An assembly according to any one of the preceding claims, characterised in that the housing has an externally-extending flange at its lower end arranged to engage the underside of a ceiling panel. 10. An assembly according to any one of the preceding claims, characterised in that the assembly includes a removable bezel arranged to be retained to the lower end of the housing, and that there is an air flow passage into the housing via the bezel.

Inventors: HOWIE ALASDAIR BUCHANAN, SPEARMAN ROBERT DON ALDO, VINCENT DAVID, HOWIE, ALASDAIR, BUCHANAN, SPEARMAN, ROBERT, DON, ALDO, VINCENT, DAVID
Applicants: HOWIE ALASDAIR BUCHANAN, SMITHS INDUSTRIES PLC, SPEARMAN ROBERT DON ALDO, VINCENT DAVID, HOWIE, ALASDAIR, BUCHANAN, SMITHS INDUSTRIES PUBLIC LIMITED COMPANY, SPEARMAN, ROBERT, DON, ALDO, VINCENT, DAVID
Application year: 1994
Main classification: F21V33
IPC codes: F21V29, F21V33, F24F13